--  @testpoint:opengauss关键字rollup(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists rollup;
create function rollup(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function rollup;

--关键字带双引号-成功
drop function if exists "rollup";
create function "rollup"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "rollup";

--关键字带单引号-合理报错
drop function if exists 'rollup';
create function 'rollup'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `rollup`;
create function `rollup`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/